Aha! Found the relevant portion of Parma and The Gift in HMRE, p.6
Of course, even if he does join the Order, an unGifted hedge wizard cannot learn Hermetic Arts, learn Parma Magica, participate in certamen, or perform any other activity that requires The Gift.
On Triamore
If those are the numbers for Triamore then we need more sources of income asap. Otherwise the whole concept of a Covenant will go down the drain and we'll all need to spend seasons making a living.
Musings on the nature of the Order
Since the Parma Magica is preserved, albeit in a lesser form (probably a Supernatural Ability) magi can once again work together in greater numbers. Due to the nature of hedge traditions membership in the Order has probably reverted to what Guernicus wanted, voluntary membership as opposed to "Join or Die." Since Certamen is not available it comes even closer to what Guernicus wanted.
However, as Guernicus also stated, there needs to be magi who enforce the Oath and Code, otherwise the Order would have failed after the last of the New Founders have passed on. This brings another problem to fore; a lot of Hedge Magic lacks the power to punch through Parma Magica. What group of magi can be the replacement for the Quasitores and what kind of magic do they wield that they can actually enforce the Oath and Code?